Let me follow you OT regarding the potassium. The solution of our blood might be seen as the re-creation of an ancient ocean, an ocean which contains potassium. Our bodies live in this ocean and our cells contain it as do the cells of any other living thing. There are foods that are high in potassium, orange juice or bananas, and if someone is in or near renal failure where potassium excretion is compromised... also perhaps they were taking a potassium sparing diuretic so should avoid potassium pills and they might, out of excessive caution, avoid those and similar fruits.